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Next week on Casualty (August 12), Faith tells a shocking lie when Stevie discovers her secret, while Donna's guilt over the car crash weighs heavily on her.

Here's a full collection of the biggest moments coming up:

1. Max takes action


The team are forced to gather in Max's office, where he explains that someone is stealing diazepam from the drugs cupboard. He tells them to be vigilant and that preventative measures will be put in place.

Max then asks Stevie how Faith is doing and she promises to pass the message along.

Faith, however, is elsewhere having her fix of drugs.

2. Iain and Jacob deal with an acid attack


Iain and Jacob arrive at a rave in a warehouse.

They are horrified to realise there has been an acid attack and immediately call for further assistance.

Later in the day, Iain finds himself in a terrifying position when a situation gets out of hand.

3. Faith is left panicked


Stevie voices her frustrations over the new counter-signing system for drugs as the team prepares for the acid attack victims to arrive.

Faith takes charge of the situation at the main entrance but is thrown when Stevie informs her of the stolen diazepam and Max's prevention plan.

Panicked, Faith tries to reach more drugs, only to find this is now impossible under Max's new rules.

4. Cam finds himself in the firing line


Cam forgets to sign off morphine on the drugs chart, much to Stevie's annoyance.

As Faith collects antibiotics for cancer patient Viv, Stevie tells her about Cam forgetting to sign for the morphine and wonders if he's to blame for the missing diazepam.

As Faith remains quiet, Stevie seemingly doesn't suspect her friend. Faith then asks Stevie to sign off diazepam for Viv, when in reality, she doesn't need it.

5. Stevie discovers the truth


Knowing she needs to be extra vigilant, Stevie double-checks Viv's prescription and realises it was less than what was signed off.

Stevie begins to connect the dots and heads into the staffroom. She searches Faith's open locker, where she finds the rest of the diazepam.

Furious, Stevie tells Faith that she will be reporting her to Max.

6. Donna continues to struggle


Donna is under more pressure than ever as she juggles her responsibilities at home and work.

To add to her problems, Ashley, who was one of the crash victims, is brought into the ED with a self-inflicted wound.

7. Faith tells a shocking lie



Backed into a corner, a panicked Faith is forced to contemplate her next move.

She decides to be honest with Stevie about everything, but ultimately bottles it and lies ? telling Stevie she has ovarian cancer and the diazepam was for the pain.

Faith begs her to keep it a secret, and a guilty Stevie agrees.

8. Donna's guilt intensifies


Ashley once again asks Donna to tell the truth about the crash and how she was on the wrong side of the road.

When she doesn't agree, Ashley loses his temper and knocks a tray of medical tools over onto the floor, cutting Donna in the process.

Afterwards, a subdued Ashley tells Donna that he can't get his mum's benefits because she's in hospital, and he can't get to work because his car is ruined.

Donna tries to stay positive about it, but her maternal instinct kicks in and she struggles with her guilty conscience.

9. Ryan tries to make amends with Cam


Cam is still smitten with Jodie, despite the distraction of the dog that Ryan gave him.

Ryan tries to give him some advice, but Cam insists that he doesn't want to hear it ? and he's not forgiven him, either.